backend/internal/config/storage.go

package config

import (
	"context"
	"fmt"
	"time"

	"github.com/minio/minio-go/v7"
	"github.com/minio/minio-go/v7/pkg/credentials"
)

// S3Config S3 存储配置
type S3Config struct {
	Endpoint  string `mapstructure:"endpoint"`
	AccessKey string `mapstructure:"access_key"`
	SecretKey string `mapstructure:"secret_key"`
	Bucket    string `mapstructure:"bucket"`
	UseSSL    bool   `mapstructure:"use_ssl"`
	Region    string `mapstructure:"region"`
	Domain    string `mapstructure:"domain"` // 自定义域名，如 s3.carrot.skin
}

// NewS3 创建 S3 客户端
func NewS3(cfg *S3Config) (*minio.Client, error) {
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
	defer cancel()

	client, err := minio.New(cfg.Endpoint, &minio.Options{
		Creds:  credentials.NewStaticV4(cfg.AccessKey, cfg.SecretKey, ""),
		Secure: cfg.UseSSL,
	})
	if err != nil {
		return nil, fmt.Errorf("failed to create S3 client: %w", err)
	}

	exists, err := client.BucketExists(ctx, cfg.Bucket)
	if err != nil {
		// Access Denied 或网络不通时，跳过 bucket 检查，假定 bucket 已存在
	} else if !exists {
		if err := client.MakeBucket(ctx, cfg.Bucket, minio.MakeBucketOptions{
			Region: cfg.Region,
		}); err != nil {
			return nil, fmt.Errorf("failed to create bucket: %w", err)
		}
	}

	return client, nil
}